Chemical Physics Letters, 2006

We have developed two bright hyper-Rayleigh/hyper-Raman spectrometers that allow the collection of spontaneous signals with high-quality and good spatial resolution. The first macro-spectrometer has been addressed to the study of liquids. The second is a new and original micro-spectrometer which has been designed to study solid and interface media. The micro-hyper-Raman spectrometer opens new fields of investigation since it provides vibrational informations, on IR-active but Raman-inactive modes, at the micrometer scale. Thus, the combination of Raman and hyper-Raman methods accomplishes high spatial resolution vibrational micro-spectroscopy.

Journal of Raman Spectroscopy, 2013

are highlighted in this review and reflect topics and advances at the frontier of Raman spectroscopy, a field that is expanding rapidly as a sensitive photonic probe of matter at the molecular level in an ever widening sphere of novel applications.

Nanoscale Research Letters, 2019

Driven by applications in chemical sensing, biological imaging and material characterisation, Raman spectroscopies are attracting growing interest from a variety of scientific disciplines. The Raman effect originates from the inelastic scattering of light, and it can directly probe vibration/rotational-vibration states in molecules and materials. Despite numerous advantages over infrared spectroscopy, spontaneous Raman scattering is very weak, and consequently, a variety of enhanced Raman spectroscopic techniques have emerged. These techniques include stimulated Raman scattering and coherent anti-Stokes Raman scattering, as well as surface-and tip-enhanced Raman scattering spectroscopies. The present review provides the reader with an understanding of the fundamental physics that govern the Raman effect and its advantages, limitations and applications. The review also highlights the key experimental considerations for implementing the main experimental Raman spectroscopic techniques. The relevant data analysis methods and some of the most recent advances related to the Raman effect are finally presented. This review constitutes a practical introduction to the science of Raman spectroscopy; it also highlights recent and promising directions of future research developments.

1990

We report resonant and nonresonant surface-enhanced hyper-Raman scattering (SEHRS) spectra of basic fuchsin and 3-hydroxykynurenine in the Ag colloid system with a picosecond pulse laser of high repetition rate. (82 MHz). It is demonstrated that, at constant average power, fiber-optic compression of the 100 ps fundamental output of a Nd: YAG laser to = 5 ps increases the intensities of surface-enhanced hyper-Raman scattering and second-harmonic generation by approximately one order of magnitude. We have thus obtained highquality SEHRS spectra for both molecules with only 0.1 W laser excitation. These results are significant in the development of SEHFLS as a useful spectroscopic technique.

Optics and Spectroscopy, 2014

The Dipole Quadrupole theory of Surface Enhanced Hyper Raman Scattering (SEHRS), created by the authors is expounded in detail. Peculiarities of behavior of electromagnetic field on rough metal surfaces are considered. It is demonstrated that there is an enhancement of the dipole and quadrupole light-molecule interaction near the places of the surface with a large curvature. The expression for the SEHRS crosssection of symmetrical molecules is obtained. Selection rules for the scattering contributions are derived and a qualitative classification of the contributions after the enhancement degree is performed. Analysis of experimental spectra of pyrazine and phenazine, and also some another molecules is performed too. It is demonstrated a full coincidence of experimental regularities in these spectra with the theory suggested.

Journal of Raman Spectroscopy, 2008

This special issue of Journal of Raman Spectroscopy is published in honour of Professor Hiro-o Hamaguchi on the occasion of his 60 th birthday. The papers have been contributed by his colleagues who have had and continue to have the privilege of working with or alongside him. They highlight some of the areas in which Hiro-o has made significant contributions to vibrational spectroscopy, including timeresolved spectroscopy, instrument and technique development, microscopy and the application of Raman spectroscopy to probe biological systems.

Raman Spectroscopy, 2018

This book gives a wide overview of the state-of-the-art applications of Raman spectroscopy in characterization of materials and biomaterials. The Raman signal is intrinsically smaller than other vibrational techniques; however, mainly through intensification processes, such as resonance Raman (RR) and surface-enhanced Raman spectroscopy (SERS), the Raman cross section can be strongly amplified. Thoroughly in these signal amplifications, the study of a diversity of chemical systems and the use of Raman technique for in situ and in vivo measurements is possible. The main goal of this book is to open up to an extended audience the possibilities of uses of Raman spectroscopy. In fact, this collective work will be beneficial to students, teachers, and researchers of many areas who are interested to expand their knowledge about Raman spectroscopy applied to nanotechnology, biotechnology, environmental science, inorganic chemistry, and health sciences

The following paper is a brief review on Raman spectroscopy, showing how is the interaction of photons with the electron cloud of the molecule. It is explained how this process generates three different lines (Rayleigh, Stokes, anti-Stokes) based of the scattering effect. Then it is described the set up of a Raman spectrometer and why it is the most useful characterization technique in these days. Finally, it is given some common applications of this powerful tool.

Applied Optics, 1999

A comparison of the spectroscopic parameters of Raman-active vibronic modes in various crystalline materials with a view to the use of these crystals for stimulated Raman scattering ͑SRS͒ is presented. It includes data on the Raman frequency shift, linewidth, integral, and peak Raman scattering cross sections. For steady-state SRS the highest Raman gain coefficient has been proved to be in barium nitrate and sodium nitrate crystals; for transient SRS it is expected to be in lithium niobate and tungstate crystals. Barium tungstate and strontium tungstate are proposed as new highly efficient Raman materials for both SRS cases.

Raman spectroscopy is an increasingly popular technique in many areas including biology and medicine. It is based on Raman scattering, a phenomenon in which incident photons lose or gain energy via interactions with vibrating molecules in a sample. These energy shifts can be used to obtain information regarding molecular composition of the sample with very high accuracy. Applications of Raman spectroscopy in the life sciences have included quantification of biomolecules, hyperspectral molecular imaging of cells and tissue, medical diagnosis, and others. This review briefly presents the physical origin of Raman scattering explaining the key classical and quantum mechanical concepts. Variations of the Raman effect will also be considered, including resonance, coherent, and enhanced Raman scattering. We discuss the molecular origins of prominent bands often found in the Raman spectra of biological samples. Finally, we examine several variations of Raman spectroscopy techniques in practice, looking at their applications, strengths, and challenges. This review is intended to be a starting resource for scientists new to Raman spectroscopy, providing theoretical background and practical examples as the foundation for further study and exploration.